Direct CP violation in τ± → K±ρ0(ω)ντ → K± π+ π- ντ

被引：0
作者：
Wang, Chao [1 ]
Guo, Xin-Heng [1 ]
Liu, Ying [1 ]
Li, Rui-Cheng [1 ]
机构：
[1] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL C | 2014年 / 74卷 / 11期
关键词：
TAU; DECAYS;
D O I：
10.1140/epjc/s10052-014-3140-8
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We study the direct CP violation in the tau(+/-) -> K-+/-rho(0)(omega)nu(tau) -> K +/- pi(+)pi(-)nu(tau) decay process in the standard model. An interesting mechanism involving the charge symmetry violating mixing between rho(0) and omega is applied to enlarge the CP asymmetry. We find that the CP-violating asymmetry can be enhanced greatly via this rho-omega mixing mechanism when the invariant mass of the pi(+)pi(-) pair is in the vicinity of the omega resonance. With this mechanism, the maximum differential and localized integrated CP asymmetries can reach -(5.6(-1.7)(+2.9)) x 10(-12) and 6.3(-3.3)(+2.4) x 10(-11), respectively, which is still negligible.
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页数：10
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